WO2012007136A1

WO2012007136A1 - Clamping body for an electric conductor

Info

Publication number: WO2012007136A1
Application number: PCT/EP2011/003422
Authority: WO
Inventors: Uwe Ambrosy; Michael Schäfer
Original assignee: Phoenix Contact Gmbh & Co. Kg
Priority date: 2010-07-13
Filing date: 2011-07-08
Publication date: 2012-01-19
Also published as: CN103052730A; US20130115827A1; DE102010027082A1; US8911270B2; ES2784126T3; CN103052730B; PL2593573T3; EP2593573A1; EP2593573B1

Abstract

The invention relates to a clamping body (10) for an electric conductor, comprising a clamping body pocket (12) that forms a receiving space (14) for receiving the electric conductor. A threaded bore (24) is formed in a lateral wall (22) of the clamping body pocket (12) in order to receive a screw. The aim of the invention is to devise a solution in which the clamping body (12) substantially has the properties of a clamping body that is made of an alloy containing brass and simultaneously complies with the EU guidelines and regulations prohibiting certain materials. This is achieved in that the clamping body pocket (12) is formed from an alloy containing aluminum, said alloy having a tensile strength of 380 N/mm² to 480 N/mm².

Description

Clamping body for an electrical conductor

The invention relates to a clamping body for a

electrical conductor with a clamping body pocket, which forms a receiving space for receiving the electrical conductor, wherein in a side wall of the clamping body pocket, a threaded bore for receiving a screw is formed. Such trained as a screw terminal clamp body are used for example in electrical terminals, such as terminal blocks or luster terminals. Electrical connection terminals with screw connection are characterized by their high clamping force that can be continuously transmitted to electrical conductors for years. With this type of terminal predetermined high clamping forces can be maintained without fluctuations even when acting on the electrical terminal vibration. Due to these properties, electrical connection terminals with screw connection are also preferred in demanding industrial applications with moving and oscillating machine parts.

To form an electrical connection terminal, the clamping body is usually arranged in an insulating material housing. The clamping body pocket of the clamping body may be formed of an electrically conductive material. On a side wall of the clamping body pocket, a guided into the receiving space of the clamping body threaded bore is formed, in which a screw is inserted. The screw head of the screw is about one in the

Opening provided insulating material housing so that the screw can be rotated with its tip into the receiving space and can clamp an electrical conductor inserted therein. But it is also possible that at When the screw is actuated, the screw pulls the clamp body upwards and presses the conductor against a current bar, so that there is no direct contact between conductor and screw.

The clamping body pocket can be made of a bent band-shaped sheet metal element which is bent or folded according to the contour of the clamping body pocket. For such a pinch body pocket, a steel material or a material containing a brass-containing alloy is usually used. Furthermore, the clamping body pocket can be made of a solid profile, which by

machining processes, such as sawing, drilling, milling, broaching, tapping, are machined accordingly to obtain the shape of the pinch body pocket.

Opposite one of a curved band-shaped

Sheet metal element produced clamping body pocket, the clamping body pocket made of a solid profile has a more uniform outer contour, since no folding or

Umbiegestellen must be provided. In addition, a made of a solid profile clamping body pocket with smaller dimensions than one of a curved

band-shaped sheet metal element produced clamping body pocket be formed, whereby the space requirement of

Clamping pocket can be reduced. In addition, made of a solid profile clamping body pockets have a longer trained threaded hole, whereby by means of the screw inserted in the threaded hole a higher torque and thus a higher axial force on the clamped by means of the screw electrical conductor

can be applied. One from a solid profile

formed clamping body pocket is usually made of a brass-containing alloy, which improved

Strength and higher corrosion resistance relative to a clamping body pocket made of steel. To the processing, in particular in relation to the

Machining to improve the brass-containing alloy, it is customary to provide the material of the clamp body and thus the brass-containing alloy with lead or to use lead-containing brass alloys. However, these lead additives are disadvantageous when it comes to the EU's lead-free products directive

(Prohibition Regulation of the electrical industry or the

Old Vehicle Ordinance). In addition, the

Production of sprags with a brass-containing alloy relatively expensive.

The invention is based on the object to provide a solution in which a clamping body has substantially the properties of a sprag made of a brass-containing alloy body and at the same time complies with the EU directives and the StoffVerbotsverordnungen. The object is achieved by the

Features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

In a clamp body of the type described in more detail, this object is achieved in that the

Clamping body bag is formed of an aluminum-containing alloy, which has a tensile strength of 380 N / mm ² to 480 N / mm ² . Surprisingly, it has been shown that in the

Use of an aluminum-containing alloy with a tensile strength of 380 N / mm ² to 480 N / mm ² for a

Pinch bag essentially the same

Properties can be achieved as in use a leaded brass containing

Alloy. In particular, an equally good

Machinability of the material can be achieved without lead additives are necessary. The fact that now an alloy is used, which no lead additives

has, the inventive clamping body or the clamping body pocket of the clamp body meets the EU Directive on unleaded products and the Substance Prohibition Regulation and is also recyclable. In addition, the lead additives that are no longer necessary can reduce the production costs of the

Clamping body can be reduced. Furthermore, the clamping body by the use of an aluminum-containing alloy for the pinch body pocket a much lower weight than a pinch body pocket made of a brass-containing

Alloy, so that a weight saving can be achieved. Due to the fact that the aluminum-containing alloy has a tensile strength of 380 N / mm ² to 480 N / mm ² , the aluminum-containing alloy and thus the

Clamping pocket no or at least only a very small relaxation, so that the operability, in particular the clamping ability or the clamping force of such a clamp body when clamping an electrical conductor has a very long service life, without the clamping effect wears off because of the good mechanical properties , in particular the high tensile strength of the material of the clamping body pocket from 380 N / mm ² to 480

N / mm ² , can prevent the material of the

Pinion pocket gives way and due to the

applied voltage by the clamping force widens. A tensile strength of 380 N / mm ² to 480 N / mm ² means here that the aluminum-containing alloy used as material for the pinch body pocket has a tensile strength of 380

N / mm ² , 480 N / mm ² or a value between 380 N / mm ² and 480 N / mm ² . According to a preferred embodiment of the invention, the aluminum-containing alloy contains magnesium. The addition of magnesium in the aluminum-containing alloy, the strength, in particular the tensile strength, the

aluminum-containing alloy and thus the pinch body pocket can be improved, so that a possible relaxation of the material of the pinch body pocket can be further reduced. Preferably, the aluminum-containing alloy

0.35 - 1.2 wt .-%, preferably 0.6 to 1.2 wt .-%, of magnesium.

It is preferably provided that the aluminum-containing alloy has a copper content of 1.2% by weight. By a copper content in the aluminum-containing alloy of ^ 1.2 wt .-%, the aluminum-containing alloy has a very good corrosion resistance, in particular a very good resistance to contact corrosion, even without the aluminum-containing alloy and thus the

Clamp bag with an additional

Surface coating must be provided. The

Corrosion resistance remains constant over the service life and is independent of damage to the

Surface of the aluminum-containing alloy clamping body pocket. Such

aluminum-containing alloy also has a much better corrosion resistance than with a

Surface coating provided steel materials. Furthermore, it is advantageously provided that the aluminum-containing alloy has a silicon content ^ 1, 4% by weight. More preferably, it is provided that the

aluminum-containing alloy is an aluminum wrought 6000 series Al-Mg-Si. The aluminum-containing alloy thus preferably has the constituents aluminum (AI), magnesium (Mg) and silicon (Si). The

Aluminum wrought 6000 series Al-Mg-Si is characterized by a very high corrosion resistance.

In addition, the formed from an aluminum wrought 6000 series Al-Mg-Si clamping body pocket has a very good machinability and a very good formability and the material state remains even in thermal

Operating stresses, especially at

Long-term loads, stable up to 150 ° C. Short-term higher temperatures up to about 180 ° C are also

critical.

According to a particularly preferred embodiment of

According to the invention, the aluminum-containing alloy is AlSilMgCuMn (EN AW-6056). Such an aluminum-containing alloy has a high strength, in particular a high tensile strength, a very good

Corrosion resistance, good machinability and

Formability, no or only a very small

Relaxation behavior, so that a pinch body pocket with such an aluminum-containing alloy in

Essentially the same properties as one

A sprag pocket made of a lead-containing brass-containing alloy, wherein the

Pinch body pocket from a corresponding

aluminum-containing alloy has a lower weight and lower manufacturing costs than a sprag pocket made of a brass-containing alloy. According to a further advantageous embodiment of the

Invention it is provided that the clamping body pocket is provided with a surface coating. The

Surface coating may be formed for example by a nickel coating. Before applying the nickel coating, the surface of the

stained aluminum-containing alloy of the sprag pocket, preferably zinc-treated. Furthermore, the

Surface coating may also be provided such that the surface of the aluminum-containing alloy of

Anchor body pocket is anodized, so that on the surface of an aluminum oxide layer, a so-called hardcoat surface, arises, which acts electrically insulating. Further, it is possible a sub-copper as

Provide surface coating. However, it is also possible to provide no surface coating.

The clamping body pocket is according to a further advantageous embodiment of the invention of a solid profile

educated. Full profile here means that the

Clamp bag made of one piece, preferably one

Rectangular profile wire is made, which is machined by cutting, broaching and drilling to a clamping body pocket with a receiving space for receiving an electrical conductor and a threaded hole

train. Such made of a solid profile clamping body pockets are hitherto usually made of a brass-containing alloy containing brass or of brass alloys with a Bleianteil. Due to the particular good Zerspannbarkeit the

according to the invention made of an aluminum-containing alloy clamping body pocket such made of a solid profile clamping body pockets now made of an aluminum-containing alloy having solid profile which does not have lead additives but has substantially the same properties, in particular mechanical properties, as a sprag pocket made of a brass-containing alloy.

Alternatively, it is further advantageous

Embodiment of the invention provided that the

Clamping body pocket is formed from a curved band-shaped element. Such clamping body pockets are usually made of a steel material or a material with a brass-containing alloy. Compared with a clamping body pocket, in particular made of a steel material, a clamping body pocket according to the invention made of an aluminum-containing alloy has a particularly better corrosion resistance with equally good or better formability.

Furthermore, the invention relates to an electrical

Connecting terminal comprising a clamping body as above and further educated.

Hereinafter, the invention with reference to the accompanying drawings by way of a preferred

Embodiment explained in more detail.

Show it:

Fig. 1 is a schematic representation of a

inventive clamping body in one

Side view;

Fig. 2 is a schematic sectional view of the in Fig.

1 shown clamping body according to the invention; and Fig. 3 is a schematic representation in the form of a

Top view of the clamping body according to the invention shown in Fig. 1. The clamping body 10 shown in FIGS. 1 to 3 has a clamping body pocket 12, which is formed from a solid profile and is machined by machining,

in particular milling, broaching and drilling, made of, for example, a rectangular profile wire. The

Clamping body pocket 12 has a receiving space 14, which is in the form of a, as seen in Fig. 2, through-hole, on, through which, not here

shown, to be clamped and connected

electrical conductor can be introduced. Of the

Receiving space 14 is bounded by a first side wall 16, a second side wall 18, a bottom-side side wall 20 and a ceiling-side side wall 22 of the pinch body pocket 12. As can be seen in Fig. 2, in the ceiling-side side wall 22, a threaded bore 24 for receiving a, not shown here, screw is formed, by means of which the introduced into the receiving space 14 conductor can be clamped and connected.

In Fig. 3, the terminal block is shown in a plan view of the ceiling-side side wall 22, in which the

Tapped hole 24 is provided. The clamping body pocket 12 is made of an electrically conductive, lead-free, aluminum-containing alloy, preferably

AlSilMgCuMn formed, which has a tensile strength between 380 N / mm ² and 480 N / mm ² and is characterized by a particularly good machinability, very good Corrosion resistance, no or very little relaxation properties, low weight and low production costs.

LIST OF REFERENCE NUMBERS

Clamping body 10

Pinion pocket 12 receiving space 14

Side wall 16

Side wall 18

Side wall 20

Side wall 22 Threaded hole 24

Claims

claims

1. clamping body for an electrical conductor with a clamping body pocket (12) which forms a receiving space (14) for receiving the electrical conductor, wherein in a side wall (22) of the clamping body pocket (12) is formed a threaded bore (24) for receiving a screw .

characterized in that

the pinch body pocket (12) is formed of an aluminum-containing alloy having a tensile strength of 380 N / mm ² to 480 N / mm ² .

2. clamp body according to claim 1, characterized in that the aluminum-containing alloy contains magnesium.

3. clamping body according to claim 1 or 2, characterized

characterized in that the aluminum-containing alloy has a copper content of -S 1.2 wt .-%.

4. Clamping body according to one of claims 1 to 3, characterized in that the aluminum-containing alloy has a silicon content ^ 1.4 wt .-%.

5. Clamping body according to one of claims 1 to 4, characterized in that the aluminum-containing alloy is an aluminum wrought alloy series 6000 Al-Mg-Si.

6. Clamping body according to one of claims 1 to 5, characterized in that the aluminum-containing alloy is AlSilMgCuMn.

7. clamping body according to one of claims 1 to 6, characterized in that the clamping body pocket (12) is provided with a surface coating.

8. clamping body according to one of claims 1 to 7, characterized in that the clamping body pocket (12) is formed of a solid profile.

Clamping body according to one of claims 1 to 8, characterized in that the clamping body pocket (12) is formed from a curved band-shaped element.

Electrical connection terminal comprising a clamping body (10) according to one of claims 1 to 9.